OSD Board Ports

The XtremeOSD board has quite a number of pins that are grouped together in pairs called ports and majority of them reside on the edge of the board while a few are on top of the PCB.
This chapter of the manual documents the particulars of each port header and what their purpose is by breaking down the ports down into dedicated sections.

Power Header

Pin #

Name

Description

1

+ (Plus)

Power +6.5 volts minimum to +36.0 volts maximum.

2

– (Minus)

Power grounding connection. Reverse polarity protected.

Video Out and In Header

The video out and video in ports are apart of the same 22 pin header. The following table makes it clear as to which pins belong to which ports.

Pin #s

Port

Description

1 - 6

Video Out

Video output signals.

7 - 14

Video In 0

Video input signals for the main video overlay by default.

15 - 22

Video In 1

Video input signals for the Picture-in-Picture overlay window by default.

Video Out

There are three video output signal pins and three corresponding ground pins that make up the video out port.
They are capable of providing one to two Composite (CVBS) and one S-Video video out signals. There is a choice of one or two Composite signals out, or just one S-Video signal out.
S-Video and Composite(s) are not both available at the same time even though physically the pins are there because the video signal encoder chip used does not support outputting S-Video and Composite at the same time.

Port Pins

Pin #

Name

Description

1

CVBS

Composite only output pin when either single or dual-CVBS modes are used.

3

Y

Luminance signal only when S-Video mode is used.

5

C/CVBS

Chrominance signal when S-Video mode is used, else second composite output when dual-CVBS mode is used.

2, 4, 6

GND

Common grounding connection, intended for video signal connections.

Port Modes

As explained in the top Video Out section that there are some video signal out combinations that are allowed and the table below shows as to which video out pins are used for particular video out modes.

Denotes which pins are used for a particular group and/or operation mode.

Video In 0 & 1

There are two video input ports that are identical in operation and configuration which are Video In 0 and Video In 1.
The only difference between the two is Video In 0 is normally used for the background video overlay and Video In 1 is normally used for Picture-in-Picture overlay window.
This is typical and default configuration for the two video input ports. Their roles can of course be swapped in the OSD User Configuration tool.
Both video input ports are also individually configurable for their operation modes which determine each port's input pins are set for particular video signal types or formats.

Each video input port has four video input signal pins and four corresponding ground pins that make up the video in port.
They are capable of providing one to four Composite (CVBS) inputs, up to two S-Video inputs with up to two Composite (CVBS) inputs, or one Composite (CVBS) input with one Component (YPbPr) input video signal pin sets at the same time.
Note that however only one video pin set in a given video input port can be active at the same time because each video port goes to their own video decoder chip and the decoded video stream in turn goes to a dedicated video capture unit on the microcontroller.
Effectively only two video signals total, one from each video input port, can be active at the same time where one is for the background video overlay and the other for Picture-in-Picture video overlay window.

Ports Pins

The following table describes the purpose of each individual video input pin is for both video in ports. The pattern is describes a video pin for Video In 0 followed by a pin that has same purpose but for Video In 1 then another Video In 0 pin and on until the description for GND pins.

Port Modes

As explained in the top Video In 0 & 1 section that there are some video signal input combinations that are allowed and the table below shows as to which video in pins are used for particular video input modes.
Note that the following table describes what each video input mode does to configure the individual video input pins for both Video In 0 and Video In 1 ports, however each Video In port is individually mode configurable.
Meaning Video In 0 can be set to mode 0 for four composite selectable video sources and Video In 1 can be set to mode 1 for two S-Video selectable video sources at the same time.

and

denotes which pins are used for a particular set and/or operation mode.

CAN Header

Controller Area Network header provides pins to two CAN differential bus transceivers, ground, and +5.0 volt power connections. Intended only to be used with 5 volt CAN buses.

Header Pins

Pin #

Name

Description

1, 2

+5.0V In

Power to the onboard CAN bus transceivers. Must be regulated +5.0 volts.

3, 4

GND

Common grounding connection, intended for CAN bus signal connections.

5

CAN0_P

CAN0 bus high/positive differential signal connection. Could also be called or labeled as CAN0_H. Labeled as CAN0_N or D– on rev 2.2 PCBs.

6

CAN1_P

CAN1 bus high/positive differential signal connection. Could also be called or labeled as CAN1_H. Labeled as CAN1_N or D– on rev 2.2 PCBs.

7

CAN0_N

CAN0 bus low/negative differential signal connection. Could also be called or labeled as CAN0_L. Labeled as CAN0_P or D+ on rev 2.2 PCBs.

8

CAN1_N

CAN1 bus low/negative differential signal connection. Could also be called or labeled as CAN1_L. Labeled as CAN1_P or D+ on rev 2.2 PCBs.

CAN Ports

The Controller Area Network header has connections for two separate CAN transceivers in turn connect to two CAN controllers on the microcontroller.
These two sets of connections are called ports, the first is channel 0 on the top side of the header, and the second is channel 1 on the bottom side of the header.

CAN Channel 0:

This port has terminating resistors or also known as a terminated CAN port.

Pin #

Name

Description

1

+5.0V In

Power to the onboard CAN bus transceivers. Must be regulated +5.0 volts.

3

GND

Common grounding connection, intended for CAN bus signal connections.

5

CAN0_P

CAN0 bus high/positive differential signal connection.

7

CAN0_N

CAN0 bus low/negative differential signal connection.

CAN Channel 1:

This port does not have terminating resistors or also known as non-terminated CAN port.

Pin #

Name

Description

2

+5.0V In

Power to the onboard CAN bus transceivers. Must be regulated +5.0 volts.